I was listening to my TATU (original Russian version) CD and I realized that the mood of the song was perfect for Wolf's Rain. I worked on it bit by bit and, oddly enough, didn't come up with a solid concept until about halfway through. In the series Paradise is depicted as a physical place, but the way I view it, Paradise is the pursuit of it with the people you love. I tried to depict that as a story arc--searching, finding, losing, searching again.